This report describes research on developing a modeling framework for analyzing improvements in airport intermodal connectivity. It is part of a project which has as its objective to use a combined quantitative and qualitative approach to planning for improved intermodal connectivity at California airports. The quantitative approach involves the development of an Intermodal Airport Ground Access Planning Tool (IAPT) that combines an air passenger mode choice model, a model of transportation provider behavior and a traffic network analysis model. The study involves a selected case study of airports utilizing the IAPT. The qualitative approach is used to enhance the quantitative analysis to account for those factors which are difficult to quantify and to provide recommended policy and planning guidelines. The qualitative approach involves a case study of select airports to identify and evaluate the potential effectiveness of alternative projects to improve the connectivity between the airports and the rest of the intermodal transportation system. The goal of developing the IAPT is to ensure a consistent approach to analyzing alternative projects and simplify the complicated modeling and computational aspects by providing decision makers and planners with a userfriendly interface to a standard set of analysis modules.